If you don't mind soldering, my kits are pretty much impossible to beat for the power and reliability vs the cost. If you want the very best and can afford it, buy a GeckoDrive. If you want good value, at low cost, DO NOT buy cheap crap from China! (you already learned with the TB6560) But if you must, the TB6600's can be... twitchy, but ok and the DM542 and others like it are well spoken of...